Here’s a tip for anyone that has an EVO battery that won’t light up when you push the button and won’t take a charge. This worked for me on 2 different batteries with the same problem. I was using a multi-charger, I don’t know if it will work with the regular charger.
Push and hold down the battery power button, put the battery on the multi charger while still holding the button, and continue to hold the button about 5 more seconds until the light starts flashing green. The batteries charged after that. I can take then off and put them back on the charger and they appear to be functioning properly on the EVO as well. Both show about 26:30-27 minutes flying time when powered up.
Push and hold down the battery power button, put the battery on the multi charger while still holding the button, and continue to hold the button about 5 more seconds until the light starts flashing green. The batteries charged after that. I can take then off and put them back on the charger and they appear to be functioning properly on the EVO as well. Both show about 26:30-27 minutes flying time when powered up.